CCS AH32 Shipbuilding Steel Coil
CCS AH32 Shipbuilding Steel Coil - High Strength Marine Grade Steel Certified for 0°C Impact Toughness
Detailed material data on CCS AH32 shipbuilding steel coil: chemical composition, mechanical and physical properties, international equivalents, and application guide for hull structures.
Hot rolling, controlled rolling (TMCP), normalizing, welding, cutting, cold forming
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CCS AH32 Shipbuilding Steel Coil Introduction
CCS AH32 is a high-strength hull structural steel certified by the China Classification Society (CCS), primarily designed for shipbuilding and offshore engineering. It offers a minimum yield strength of 315 MPa and guarantees reliable notch toughness at 0 °C, making it suitable for critical welded structures in moderate-temperature environments.
- Excellent weldability and formability, compatible with common shipyard fabrication processes.
- Controlled chemical composition ensures consistent mechanical properties throughout the coil.
- Complies with CCS Rules for Materials and Welding and is fully recognized by all major classification societies under IACS unified requirements.
The steel is typically supplied as hot-rolled coils or plates and can be delivered in as-rolled, normalized, or thermomechanically controlled processed (TMCP) condition depending on thickness and customer requirements.
CCS AH32 Shipbuilding Steel Coil Chemical Composition
The chemical composition of CCS AH32 steel is designed to provide a balanced combination of strength, toughness, and weldability. Maximum levels of phosphorus and sulfur are tightly controlled to ensure good ductility and weld metal soundness. Fine grain practice is typically achieved through additions of aluminium and/or microalloying elements such as niobium, vanadium, or titanium. The values below are in accordance with CCS Rules and GB 712-2011.
| Element | Specified Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.18 | Strengthener; higher carbon may impair weldability |
| Silicon (Si) | ≤ 0.50 | Deoxidizer; residual level |
| Manganese (Mn) | 0.90 – 1.60 | Primary solid solution strengthener; improves toughness |
| Phosphorus (P) | ≤ 0.035 | Impurity; kept low for ductility and weld quality |
| Sulfur (S) | ≤ 0.035 | Impurity; low level avoids hot cracking |
| Aluminium (total Al) | ≥ 0.020 | Grain refining element; total aluminium when acid soluble Al not determined |
| Acid soluble Al (Als) | ≥ 0.015 | When acid soluble method used; ensures fine grain practice |
| Niobium (Nb) | 0.015 – 0.050 | Optional microalloy; grain refinement and precipitation strengthening |
| Vanadium (V) | 0.05 – 0.10 | Optional microalloy; improves strength |
| Titanium (Ti) | ≤ 0.02 | Optional; deoxidation and grain refinement |
| Copper (Cu) | ≤ 0.35 | Residual element; no detrimental effect at this level |
| Chromium (Cr) | ≤ 0.20 | Residual element; not intentionally added |
| Nickel (Ni) | ≤ 0.40 | Residual element; slightly improves toughness |
| Molybdenum (Mo) | ≤ 0.08 | Residual element; may appear from scrap |
CCS AH32 Shipbuilding Steel Coil Physical Properties
The physical properties listed below are typical for low-carbon, manganese-silicon killed steel at room temperature unless noted otherwise. These values are not part of the CCS specification but are useful for design, thermal, and electrical calculations. The data are representative of carbon-manganese structural steels with similar composition.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | 20 °C |
| Elastic modulus (E) | 205 | GPa | Room temperature |
| Shear modulus (G) | 79.3 | GPa | Room temperature |
| Poisson's ratio (ν) | 0.3 | – | Room temperature |
| Thermal expansion coefficient (α) | 11.5 × 10⁻⁶ | per °C | 20 – 100 °C |
| Thermal conductivity (λ) | 52 | W/(m·K) | at 100 °C |
| Specific heat capacity (cp) | 486 | J/(kg·K) | at 20 °C |
| Electrical resistivity (ρ_e) | 0.22 | µΩ·m | 20 °C |
CCS AH32 Shipbuilding Steel Coil Mechanical Properties
The following mechanical properties are mandatory for CCS AH32 steel according to the CCS Rules and GB 712-2011. Tensile testing is performed at room temperature in the transverse direction unless otherwise agreed. Impact testing is carried out on Charpy V-notch specimens at 0 °C. Bending tests verify formability. Properties are grouped by thickness to reflect the effect of rolling reduction.
| Property | Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 315 | MPa | Thickness ≤ 50 mm |
| Yield Strength (ReH) | ≥ 315 | MPa | Thickness 50 mm < t ≤ 100 mm |
| Tensile Strength (Rm) | 440 – 570 | MPa | Thickness ≤ 100 mm |
| Elongation after fracture (A) | ≥ 22 | % | Thickness ≤ 50 mm, gauge length 5.65√So |
| Elongation after fracture (A) | ≥ 22 | % | Thickness 50 mm < t ≤ 100 mm, gauge length 5.65√So |
| Charpy V-notch impact energy (KV2), longitudinal | ≥ 34 | J | Test temperature 0 °C, standard 10×10 mm specimen |
| Charpy V-notch impact energy (KV2), transverse | ≥ 24 | J | Test temperature 0 °C, standard 10×10 mm specimen (optionally reported) |
| Bend test (bending angle 180°) | d=2a (crack free) | – | Thickness ≤ 25 mm (a = specimen thickness) |
| Bend test (bending angle 180°) | d=3a (crack free) | – | Thickness > 25 mm |
CCS AH32 Shipbuilding Steel Coil Fully Equivalent Grades and Standards – CCS AH32
| Country / Region | Standard / Rules | Equivalent Grade | Remarks |
|---|---|---|---|
| China | GB 712-2011 | A32 | Identical chemical and mechanical requirements; used in domestic shipbuilding. |
| International Association | IACS UR W11 | AH32 | Unified requirement adopted by all major classification societies. |
| United States | ABS Rules | ABS AH32 | American Bureau of Shipping equivalent. |
| United Kingdom | LR Rules | LR AH32 | Lloyd's Register equivalent. |
| Norway / Germany | DNV Rules | DNV A32 | DNV (Det Norske Veritas) designation. |
| France | BV Rules | BV AH32 | Bureau Veritas equivalent. |
| South Korea | KR Rules | KR AH32 | Korean Register equivalent. |
| Japan | NK Rules | NK KA32 | ClassNK (Nippon Kaiji Kyokai) equivalent. |
| Italy | RINA Rules | RINA AH32 | Registro Italiano Navale equivalent. |
CCS AH32 Shipbuilding Steel Coil Application Introduction
CCS AH32 steel coil is engineered specifically for ship and offshore construction where high strength and reliable low-temperature toughness are required. Its excellent weldability and formability allow fabrication of complex structural assemblies with conventional shipyard processes. The steel is typically cut, welded, and occasionally cold-formed into primary hull members.
Product Applications: Hull plates and profiles, Deck and bottom plating, Bulkheads and longitudinal stiffeners, Transverse webs and girders, Offshore platform structural sections
Processed into products: Shell plates (side and bottom), Main deck and inner bottom plates, Transverse framing members (web frames), Longitudinals (deck, side, bottom), Bracket plates and connection details, Engine room structural parts
Application industries: Shipbuilding (cargo ships, tankers, bulk carriers, container vessels), Offshore engineering (jack-up rigs, floating platforms, wind turbine foundations), Marine equipment (deck machinery supports, hull inserts)
CCS AH32 Shipbuilding Steel Coil Similar / Alternative Materials
| Country / Standard | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 1591-2018 | Q345C | Comparable yield strength (345 MPa) and 0°C impact; not ship-class certified. Suitable for general structural use. |
| USA | ASTM A572/A572M | Grade 50 [345] | Similar minimum strength, but different chemical composition and no 0°C impact guarantee unless supplementary requirement S5 is applied. |
| EU | EN 10025-2:2019 | S355J2 | Yield 355 MPa, impact at -20°C (J2) or 0°C (J0); for structural steel, not marine certified unless specific requirements are met. |
| International | ISO 630-2:2011 | FeE355B / Fe510C | ISO structural quality; may be used for non-critical hull parts if agreed, but lacks full classification society approval. |
| Japan | JIS G3106:2015 | SM490YA | Yield 365 MPa minimum, 0°C impact; used in welded structures, not directly equivalent to ship classification steel. |
Notes:
Delivery condition: CCS AH32 coil is generally supplied in hot-rolled condition; for thicker sections or when specified, controlled rolling (TMCP) or normalizing can be applied to enhance toughness.
Welding: Preheating is usually unnecessary for moderate thicknesses, but drying of electrodes and compliance with approved welding consumables is required. Post-weld heat treatment is rarely needed.
Surface: Coils may be supplied with a light-oiled surface or, on request, with a shop primer to protect against atmospheric corrosion during transit and storage. Edges may be mill or trimmed.
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